Abstract
A tridentate ligand 2-(6-pyrazol-1-yl-pyridin-2-yl)-1H-benzimidazole (L1H) has been synthesized and characterized by NMR, UV–Vis, IR and MS spectroscopy. Starting from L1H, two complexes have been prepared, one containing a complex dication counterbalanced by anions, [Fe(L1H)2](BF4)2 (1), and the other one is a charge neutral complex [Fe(L1)2] (2). The distorted octahedral coordination of 1 was confirmed by X-ray diffraction analysis. Both complexes show a thermally induced spin crossover with the critical temperature lying above the room temperature. The photomagnetic investigation confirmed the LIESST effect for both compounds.
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